/u/thefourthchipmunk's posts in /r/askscience

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Suppose you want a satellite to always point at earth. Can this be done if the orbit is elliptical? (I mean, since the satellite rotates on its axis at a constant rate, do the orbit and rotation get out of sync?)

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Does exhaled air contain more moisture, and how do we characterize this liquid -- alveoli fluid? Lung juice? How is it different from saliva?

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I have read that ball bearings should be packed in grease, to reduce friction between the balls & the races. In some cases, couldn't the grease INCREASE the friction, by touching parts of the ball that would otherwise be in contact with air?

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Is the effect of a gene influenced by the chromosome it appears on, or only its codons?

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If the atmosphere had double the number of gas particles, would the pressure at sea level also double? Would the same be true at all points above sea level in the air column?

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Is it correct to say that the tropics is the only part of the world where people get to see the entire night sky over the course of the year (and only the equator sees it all at once)?

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How is a jet engine different from a propeller?

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Can a seasonal fruit be made to grow out of season? (Aside from opposite hemisphere)

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Why do NASA probes/landers have such absurdly short "mission lengths" vs. their actual lifespans (e.g. Mars Opportunity)? Is NASA surprised when a probe outlives its mission?

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If comets like 67P/C-G [the rosetta comet] did not deliver earth's water, what are the remaining plausible options?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Suppose you want a satellite to always point at earth. Can this be done if the orbit is elliptical? (I mean, since the satellite rotates on its axis at a constant rate, do the orbit and rotation get out of sync?)	3
Does exhaled air contain more moisture, and how do we characterize this liquid -- alveoli fluid? Lung juice? How is it different from saliva?	3
I have read that ball bearings should be packed in grease, to reduce friction between the balls & the races. In some cases, couldn't the grease INCREASE the friction, by touching parts of the ball that would otherwise be in contact with air?	3
Is the effect of a gene influenced by the chromosome it appears on, or only its codons?	3
If the atmosphere had double the number of gas particles, would the pressure at sea level also double? Would the same be true at all points above sea level in the air column?	3
Is it correct to say that the tropics is the only part of the world where people get to see the entire night sky over the course of the year (and only the equator sees it all at once)?	3
How is a jet engine different from a propeller?	3
Can a seasonal fruit be made to grow out of season? (Aside from opposite hemisphere)	2
Why do NASA probes/landers have such absurdly short "mission lengths" vs. their actual lifespans (e.g. Mars Opportunity)? Is NASA surprised when a probe outlives its mission?	2
If comets like 67P/C-G [the rosetta comet] did not deliver earth's water, what are the remaining plausible options?	2